US7235641B2 - Bispecific antibodies - Google Patents

Bispecific antibodies Download PDF

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Publication number
US7235641B2
US7235641B2 US10/743,697 US74369703A US7235641B2 US 7235641 B2 US7235641 B2 US 7235641B2 US 74369703 A US74369703 A US 74369703A US 7235641 B2 US7235641 B2 US 7235641B2
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Prior art keywords
antigen
antibody
cell
bispecific antibody
human
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US20050136050A1 (en
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Peter Kufer
Meera Berry
Patrick Baeuerle
Christian Itin
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Amgen Research Munich GmbH
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Micromet GmbH
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Priority to CA2544562A priority patent/CA2544562C/en
Priority to DK04804237.8T priority patent/DK1697421T3/da
Priority to SI200431500T priority patent/SI1697421T1/sl
Priority to EP04804237A priority patent/EP1697421B1/de
Priority to DE602004028957T priority patent/DE602004028957D1/de
Priority to AT04804237T priority patent/ATE479710T1/de
Priority to MXPA06005592A priority patent/MXPA06005592A/es
Priority to ES04804237T priority patent/ES2350935T3/es
Priority to PCT/EP2004/014643 priority patent/WO2005061547A2/en
Priority to AU2004303510A priority patent/AU2004303510B2/en
Priority to JP2006546068A priority patent/JP5376759B2/ja
Publication of US20050136050A1 publication Critical patent/US20050136050A1/en
Priority to US11/754,792 priority patent/US20080305105A1/en
Publication of US7235641B2 publication Critical patent/US7235641B2/en
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    • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/30—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
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    • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
    • C07K14/70567—Nuclear receptors, e.g. retinoic acid receptor [RAR], RXR, nuclear orphan receptors
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    • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2803—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
    • C07K16/2809—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily against the T-cell receptor (TcR)-CD3 complex
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    • A01K2267/03—Animal model, e.g. for test or diseases
    • A01K2267/0306—Animal model for genetic diseases
    • A—HUMAN NECESSITIES
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    • A01K2267/00—Animals characterised by purpose
    • A01K2267/03—Animal model, e.g. for test or diseases
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    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
    • C07K2317/31—Immunoglobulins specific features characterized by aspects of specificity or valency multispecific
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    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
    • C07K2317/569—Single domain, e.g. dAb, sdAb, VHH, VNAR or nanobody®
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    • C07K2317/62—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments comprising only variable region components
    • C07K2317/622—Single chain antibody (scFv)
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    • C12N2830/48—Vector systems having a special element relevant for transcription regulating transport or export of RNA, e.g. RRE, PRE, WPRE, CTE

Definitions

  • the invention relates to the field of antibodies. Specifically, the invention relates to a bispecific antibody comprising two antibody variable domains on a single polypeptide chain. The invention further relates to the use of such a bispecific antibody for the preparation of a pharmaceutical composition. The invention further relates to a method for the prevention, treatment or amelioration of a disease comprising administration of an effective amount of such a bispecific antibody. Finally, the invention relates to a kit comprising such a bispecific antibody.
  • bispecific antibodies Unifying two antigen binding sites of different specificity into a single construct, bispecific antibodies have the ability to bring together two discreet antigens with extraordinar specificity and therefore have great potential as therapeutic agents. This potential was recognized early on, leading to a number of approaches for obtaining such bispecific antibodies.
  • Bispecific antibodies were originally made by fusing two hybridomas, each capable of producing a different immunoglobulin. The resulting hybrid-hybridoma, or quadroma, was capable of producing antibodies bearing the antigen specificity of the first parent hybridoma as well as that of the second parent hybridoma (Milstein et al. (1983), Nature 305:537). However, the antibodies resulting from quadromas often exhibited undesired properties due to the presence of an Fc antibody portion.
  • Each scFv unit in such constructs was made up of one variable domain from each of the heavy (VH) and light (VL) antibody chains, joined with one another via a synthetic polypeptide linker, the latter often being genetically engineered so as to be minimally immunogenic while remaining maximally resistant to proteolysis.
  • Respective scFv units were joined by a number of techniques including incorporation of a short (usually less than 10 amino acids) polypeptide spacer bridging the two scFv units, thereby creating a bispecific single chain antibody.
  • the resulting bispecific single chain antibody is therefore a species containing two VH/VL pairs of different specificity on a single polypeptide chain, wherein the VH and VL domains in a respective scFv unit are separated by a polypeptide linker long enough to allow intramolecular association between these two domains, and wherein the thusly formed scFv units are contiguously tethered to one another through a polypeptide spacer kept short enough to prevent unwanted association between, for example, the VH domain of one scFv unit and the VL of the other scFv unit.
  • Bispecific single chain antibodies of the general form described above have the advantage that the nucleotide sequence encoding the four V-domains, two linkers and one spacer can be incorporated into a suitable host expression organism under the control of a single promoter. This increases the flexibility with which these constructs can be designed as well as the degree of experimenter control during their production.
  • one scFv unit is capable of activating cytotoxic cells, for example cytotoxic T cells, within the immune system by specifically binding to an antigen on the cytotoxic cells, while the other scFv unit specifically binds an antigen on a malignant cell intended for destruction.
  • cytotoxic cells for example cytotoxic T cells
  • the other scFv unit specifically binds an antigen on a malignant cell intended for destruction.
  • bispecific single chain antibodies have been shown to activate and redirect the immune system's cytotoxic potential to the destruction of pathological, especially malignant cells. In the absence of such a bispecific single chain antibody construct, malignant cells would otherwise proliferate uninhibited.
  • bispecific single chain antibodies must fulfil additional requirements.
  • each scFv unit of a bispecific single chain antibody should remain properly folded, something which often proves unrealisable in conventional bacterial expression systems such as E. coli.
  • the need to use less conventional, more cumbersome and more costly eukaryotic—even mammalian—expression systems often complicates the production of bispecific single chain antibodies and/or reduces the amount of product obtainable to levels lower than desired for therapeutic application.
  • bispecific antibody In the event that a bispecific antibody is intended for therapeutic use, it is desirable to produce high amounts of this antibody solubly and in the desired functional form.
  • the production of functionally active antibody becomes especially critical when producing bispecific antibodies of which one portion is able to activate and recruit the cytotoxic potential of human immune effector cells.
  • a produced antibody devoid of functional activity will not lead to the desired activation of human immune effector cells
  • a bispecific antibody which is functionally active albeit not in the desired manner, as for example may be the case when the bispecific antibody is produced in a heterogeneous form containing multiple isomers, may activate and recruit the cytotoxic potential of human immune effector cells in unforeseeable and/or unintended manners.
  • bispecific antibody constructs can be of great therapeutic use in redirecting the powerful potential of the body's own immune system to achieve the destruction of diseased cells.
  • the activation of such a powerful means of eradicating or neutralizing unwanted cells requires that this power be controlled as precisely as possible so that the cytotoxic potential of the immune system is recruited and applied only in the direction intended and no other.
  • bispecific single chain antibody when one specific binding arm of a bispecific single chain antibody is to recruit the activity of a human immune effector cell, for example a cytotoxic T cell, there exists an especially heightened and, as yet, unmet need for bispecific single chain antibodies which overcome limitations as described above.
  • bispecific antibody comprising two antibody variable domains on a single polypeptide chain, wherein:
  • the second portion of the bispecific antibody comprises two antibody variable domains. According to another embodiment of the first aspect of the invention, the second portion of the bispecific antibody comprises one antibody variable domain.
  • a second aspect of the invention provides a bispecific antibody comprising two antibody variable domains on a single polypeptide chain, wherein:
  • the first portion of the bispecific antibody comprises two antibody variable domains.
  • the total number of antibody variable regions in the bispecific antibody according to the invention is thus only two.
  • the bispecific antibody of the invention is thus approximately half the size of conventional bispecific single chain antibodies containing four antibody variable domains.
  • the greater simplicity in molecular design of the bispecific antibody of the invention correlates to greater possible simplicity in the host expression system used for its production in functionally active form.
  • the small size of the inventive bispecific antibody opens up avenues of production hitherto closed to conventional bispecific single chain antibodies with four antibody variable domains.
  • the bispecific antibody of the invention may be easily produced in conventional, well understood and cheap bacterial expression systems such as E. coli in amounts which are desired for therapeutic applications.
  • Increased productivity has at least two highly advantageous effects.
  • larger amounts of the bispecific antibody of the invention can be produced in functional form per batch than previously possible for single chain bispecific antibodies with four antibody variable domains, allowing greater efficiency and, ultimately, economy in production.
  • Second, a greater number of constructs in the format of the bispecific antibody of the invention may now be considered as therapeutic candidates since a low cytotoxic activity of a bispecific construct with four antibody variable domains may now be offset by higher amounts of available therapeutic agent using the bispecific antibody of the invention.
  • the palette of possible therapeutic applications for the bispecific antibody of the invention is thereby expanded relative to that of single chain bispecific antibodies with four antibody variable domains.
  • the bispecific antibody of the invention can be produced more homogeneously than possible for single chain antibody formats with four antibody variable domains.
  • product heterogeneity may threaten the therapeutic prognosis and/or product safety profile which can be expected from a bispecific antibody capable of binding to an immune effector cell.
  • Decreasing the number of antibody variable domains in the bispecific antibody of the invention decreases the number of potential partners for intermolecular association. This eliminates pathways by which intermolecular association can take place.
  • a bispecific antibody is thus obtained which retains the intended therapeutic profile while minimizing or even abolishing formation of intermolecular association products which might mobilize the host immune response in unintended manners.
  • the two antibody variable domains are a VH- and VL-domain which are associated with one another.
  • the two antibody variable domains comprised in either the second or the first portion may be two VH domains or two VL regions which are associated with one another.
  • the two antibody variable domains may be designed as an scFv fragment, meaning that the two domains are separated from one another by a peptide linker long enough to allow intermolecular association between these two domains.
  • linkers suitable for this purpose is described in the prior art, for example in the granted patents EP 623 679 B1, U.S. Pat. No. 5,258,498, EP 573 551 B1 and U.S. Pat. No. 5,525,491.
  • a bispecific antibody according to this embodiment of the invention is a construct with a total of three antibody variable domains.
  • one antibody variable domain specifically binds alone, i.e., without being paired with another antibody variable domain (a) either to a human immune effector cell by specifically binding to an effector antigen on the human immune effector cell or to a target cell, while the remaining two antibody variable domains together specifically bind (b) either to the target antigen on the target cell or to a human immune effector cell by specifically binding to an effector antigen on the human immune effector cell, respectively.
  • an scFv exhibiting the desired binding specificity for a target antigen is already known and optimized, and omitting one of its two antibody variable domains would abolish or at least attenuate its binding characteristics.
  • Such an scFv may make up part of the bispecific antibody according to the present embodiment of the invention.
  • such a three-domain antibody may advantageously comprise an entire scFv as either its effector antigen- or target antigen-conferring portion.
  • the present embodiment of the invention allows a bispecific antibody to be formed starting from a desired scFv by simple incorporation of only one additional antibody variable domain into the same polypeptide chain as the scFv, wherein the one additional antibody variable domain incorporated has an antigen binding specificity different than that of the scFv.
  • a bispecific antibody according to this embodiment of the invention and including no more than three antibody variable domains would represent the upper limit in number of antibody variable domains for which high yielding, homogeneous production is possible while still allowing the researcher to employ preexisting binding molecules such as scFv constructs.
  • the molecular architecture according to this embodiment allows for savings in research time and resources while still conferring the advantages associated with the bispecific antibody of the invention in its minimal form.
  • the first and second portions of the bispecific antibody according to the invention or according to any of the above embodiments of the invention may be separated from one another by a synthetic polypeptide spacer moiety, which covalently (i.e., peptidically) links either the C-terminus of the first portion with the N-terminus of the second portion, or the C-terminus of the second portion with the N-terminus of the first portion.
  • the portions of the bispecific antibody according to this embodiment may be arranged, as either N-(first portion)-(second portion)-C or N-(second portion)-(first portion)-C.
  • human immune effector cell refers to a cell within the natural repertoire of cells in the human immune system which, when activated, is able to bring about a change in the viability of a target cell.
  • viability of a target cell may refer within the scope of the invention to the target cell's ability to survive, proliferate and/or interact with other cells. Such interaction may be either direct, for example when the target cell contacts another cell, or indirect, for example when the target cell secretes substances which have an influence on the functioning of another distant cell.
  • the target cell may be either native or foreign to humans. In the event that the cell is native to humans, the target cell is advantageously a cell which has undergone transformation to become a malignant cell.
  • the native cell may additionally be a pathologically modified native cell, for example a native cell infected with an organism such as a virus, a plasmodium or a bacterium.
  • the target cell is advantageously an invading pathogen, for example an invading bacterium or plasmodium.
  • the antibody variable domains of the first and/or second portions may be derived from identical or separate animal species.
  • optimal antibody variable domain/s can be chosen to be derived from the animal species known to yield the best antibodies against a particular effector and/or target antigen. In this way, this embodiment allows the researcher to capitalize on already known, developed and/or optimized specificities such that the efficiency of workflow in developing bispecific antibodies as described herein is maximized.
  • the first and/or second portion of the bispecific antibody are/is independently derived from an antibody produced in primate, rodent, tylopoda or cartilaginous fish.
  • the first and/or second portion of a bispecific antibody according to this embodiment may be either naturally occurring or genetically engineered. Alternatively, it is within the scope of the present embodiment that part of a naturally occurring antibody is used as a substrate on which further genetic engineering is performed, to finally yield a derivative of the naturally occurring part of the antibody for use in the first or second portion of a bispecific antibody according to this embodiment.
  • first and/or second portion of the bispecific antibody are/is derived from rodent
  • said first and/or second portion may advantageously be derived independently from mouse or rat antibodies.
  • one seeking to develop and/or optimize bispecific antibodies according to this embodiment of the invention can benefit from the preexisting and highly diverse palette of known murine and rat antibody sequences which bind relevant human antigens.
  • a primate antibody is used as a basis for the first and/or second portion of the bispecific antibody
  • said first and/or second portion are/is advantageously derived independently from human antibodies.
  • use of human antibody variable domains entails the further advantage that the resulting bispecific antibodies will elicit little to no immunogenic response when administered as part of a therapeutic regimen in human patients.
  • Such bispecific antibodies are thus especially suitable as therapeutic agents for use in humans.
  • a tylopoda-derived antibody variable domain is used in the first and/or second portion of a bispecific antibody according to this embodiment of the invention
  • said first and/or second portion may advantageously be derived independently from camel, llama or/and dromedary.
  • This use of such “camelid” antibodies allows the researcher seeking to develop or optimize bispecific antibodies according to this embodiment of the invention to capitalize on the unique types of antibodies known to be produced by these species. These species are namely known to produce high affinity antibodies of only a single variable domain.
  • a tylopoda antibody is used as the source for the antibody variable domain in the first and/or second portion of the bispecific antibody, it is advantageous to use the VHH domain or a modified variant thereof.
  • VHH denotes a variable region of a heavy chain of a so-called “camelid” antibody.
  • Camelid antibodies comprise a heavy chain, but lack a light chain.
  • a VHH region from such a camelid antibody represents the minimal structural element required to specifically bind to an antigen of interest in these species.
  • Camelid VHH domains have been found to bind to antigen with high affinity (Desmyter et al. (2001), J. Biol. Chem. 276:26285–90) and possess high stability in solution (Ewert et al. (2002), Biochemistry 41:3628–36).
  • said cartilaginous fish is advantageously a shark.
  • VH domain In the event that a rodent or primate antibody is used as the source for the antibody variable domain in the first and/or second portion of a bispecific antibody according to this embodiment of the invention, it is advantageous to use the VH domain or a modified variant thereof.
  • the VH domain of antibodies in these species is known to contribute significantly to the binding specificity and affinity observed for a given antibody.
  • CDR complementarity determining region
  • the bispecific antibody may be subjected to an alteration to render it less immunogenic when administered to a human.
  • an alteration may comprise one or more of the techniques commonly known as chimerization, humanization, CDR-grafting, deimmunization and/or mutation of framework region amino acids to correspond to the closest human germline sequence (germlining).
  • Subjecting the bispecific antibody of the invention to such an alteration/s has the advantage that a bispecific antibody which would otherwise elicit a host immune response is rendered more, or completely “invisible” to the host immune system, so that such an immune response does not occur or is reduced.
  • Bispecific antibodies which have been altered as described according to this embodiment will therefore remain administrable for a longer period of time with reduced or no immune response-related side effects than corresponding bispecific antibodies which have not undergone any such alteration(s).
  • One of ordinary skill in the art will understand how to determine whether, and to what degree an antibody must be altered in order to prevent it from eliciting an unwanted host immune response.
  • the human immune effector cell is a member of the human lymphoid cell lineage.
  • the effector cell may advantageously be a human T cell, a human B cell or a human natural killer (NK) cell.
  • NK human natural killer
  • such cells will have either a cytotoxic or an apoptotic effect on the target cell.
  • the human lymphoid cell is a cytotoxic T cell which, when activated, exerts a cytotoxic effect on the target cell.
  • the recruited activity of the human effector cell is this cell's cytotoxic activity.
  • activation of the cytotoxic T cell may occur via binding of the CD3 antigen as effector antigen on the surface of the cytotoxic T cell by a bispecific antibody of this embodiment of the invention.
  • the human CD3 antigen is present on both helper T cells and cytotoxic T cells.
  • Human CD3 denotes an antigen which is expressed on T cells as part of the multimolecular T cell complex and which comprises three different chains: CD3-epsilon, CD3-delta and CD3-gamma.
  • TCR T c ell r eceptor
  • variable TCR binds foreign antigen as outlined above, signaling to the T cell that this binding has taken place depends on the presence of other, invariant, signaling proteins associated with the TCR. These signaling proteins in associated form are collectively referred to as the CD3 complex, here collectively referred to as the CD3 antigen.
  • T cell cytotoxicity normally depends first on the binding of the TCR with an MHC protein, itself bound to foreign antigen, located on a separate cell. Only when this initial TCR-MHC binding has taken place can the CD3-dependent signaling cascade responsible for T cell clonal expansion and, ultimately, T cell cytotoxicity ensue.
  • T cells may be cytotoxically activated in a clonally independent fashion, i.e., in a manner which is independent of the specific TCR clone carried by the T cell. This allows an activation of the entire T cell compartment rather than only specific T cells of a certain clonal identity.
  • an especially preferred embodiment of the invention provides a bispecific antibody in which the effector antigen is the human CD3 antigen.
  • the bispecific antibody according to this embodiment of the invention may have a total of either two or three antibody variable domains.
  • lymphoid cell-associated effector antigens bound by a bispecific antibody of the invention may be the human CD16 antigen, the human NKG2D antigen, the human NKp46 antigen, the human CD2 antigen, the human CD28 antigen or the human CD25 antigen.
  • the human effector cell is a member of the human myeloid lineage.
  • the effector cell may be a human monocyte, a human neutrophilic granulocyte or a human dendritic cell.
  • such cells will have either a cytotoxic or an apoptotic effect on the target cell.
  • Advantageous antigens within this embodiment which may be bound by a bispecific antibody of the invention may be the human CD64 antigen or the human CD89 antigen.
  • the target antigen is an antigen which is uniquely expressed on a target cell in a disease condition, but which remains either non-expressed, expressed at a low level or non-accessible in a healthy condition.
  • target antigens which might be specifically bound by a bispecific antibody of the invention may advantageously be selected from EpCAM, CCR5, CD19, HER-2 neu, HER-3, HER-4, EGFR, PSMA, CEA, MUC-1 (mucin), MUC2, MUC3, MUC4, MUC5 AC , MUC5 B , MUC7, ⁇ hCG, Lewis-Y, CD20, CD33, CD30, ganglioside GD3, 9-O-Acetyl-GD3, GM2, Globo H, fucosyl GM1, Poly SA, GD2, Carboanhydrase IX (MN/CA IX), CD44v6, Sonic Hedgehog (Shh), Wue-1, Plasma Cell Antigen, (membrane-bound) Ig
  • the target antigen specifically bound by a bispecific antibody may be a cancer-related antigen, that is an antigen related to a malignant condition.
  • an antigen is either expressed or accessible on a malignant cell, whereas the antigen is either not present, not significantly present, or is not accessible on a non-malignant cell.
  • a bispecific antibody according to this embodiment of the invention is a bispecific antibody which recruits the activity of a human immune effector cell against the malignant target cell bearing the target antigen, or rendering the target antigen accessible.
  • the bispecific antibody specifically binds to the human CD3 antigen as effector antigen and to the human CD19 antigen as target antigen.
  • the human CD19 antigen is expressed in the whole human B lineage from the pro B cell to the mature B cell, it is not shed, is uniformly expressed on all lymphoma cells, and is absent from stem cells.
  • a bispecific antibody according to this embodiment namely one which specifically binds to the human CD3 antigen as effector antigen and to the human CD19 antigen as target antigen, is of great potential value as a therapeutic for the eradication of malignant B cells.
  • a bispecific antibody according to this embodiment consists of two or three antibody variable domains, separated by spacer and possibly linker polypeptides as described above.
  • the bispecific antibody specifically binds to the human CD3 antigen as effector antigen and to the human EpCAM antigen as target antigen.
  • EpCAM Epidermal cell adhesion molecule
  • 17-1A antigen KSA, EGP40, GA733-2, ks1-4 or esa
  • EpCAM has been shown in various studies to be beneficial in diagnosis and therapy of various carcinomas. Furthermore, in many cases, tumor cells were observed to express EpCAM to a much higher degree than their parental epithelium or less aggressive forms of said cancers.
  • a bispecific antibody according to this embodiment namely one which specifically binds to the human CD3 antigen as effector antigen and to the human EpCAM antigen as target antigen is of great potential value as a therapeutic for the eradication of malignant epithelial cells.
  • a bispecific antibody according to this embodiment consists of two or three antibody variable domains, separated by spacer and possibly linker polypeptides as described above.
  • An anti-CD3 ⁇ anti-EpCAM bispecific antibody according to this latter embodiment may advantageously have the amino acid sequence as set out in SEQ ID NO: 1.
  • a bispecific antibody according to this embodiment has as its first portion a murine-derived VH specifically binding the human CD3 antigen as effector antigen and, as its second portion, an scFv unit specifically binding the human EpCAM antigen as target antigen.
  • SEQ ID NO: 1 represents a bispecific antibody with three antibody variable domains.
  • a further aspect of the invention provides a use of a bispecific antibody as disclosed hereinabove for the preparation of a pharmaceutical composition for the prevention, treatment or amelioration of a proliferative disease, a tumorous disease, an inflammatory disease, an immunological disorder, an autoimmune disease, an infectious disease, a viral disease, an allergic reaction, a parasitic reaction, a graft-versus-host disease or a host-versus-graft disease.
  • a further aspect of the invention provides a method for the prevention, treatment or amelioration a proliferative disease, a tumorous disease, an inflammatory disease, an immunological disorder, an autoimmune disease, an infectious disease, a viral disease, an allergic reaction, a parasitic reaction, a graft-versus-host disease or a host-versus-graft disease in a subject in the need thereof, said method comprising the step of administration of an effective amount of a bispecific antibody as disclosed hereinabove.
  • the prevention, treatment or amelioration occurs in a human.
  • the tumorous disease is preferably selected from the group of B cell disorders, for example a lymphoma, a B cell lymphoma and a Hodgkin's lymphoma.
  • the B cell lymphoma is a non-Hodgkin's lymphoma.
  • the autoimmune disease is selected from rheumatoid arthritis, multiple sclerosis, type 1 diabetes mellitus, inflammatory bowel disease, systemic lupus erythematosus, psoriasis, scleroderma and autoimmune thyroid diseases.
  • any administration of a bispecific antibody as described hereinabove may advantageously be coupled with the administration of a proteinaceous compound capable of providing an activation signal for immune effector cells.
  • a proteinaceous compound capable of providing an activation signal for immune effector cells.
  • Such a proteinaceous compound may advantageously be administered simultaneously or non-simultaneously with the bispecific antibody.
  • a further aspect of the invention is a kit comprising a bispecific antibody as disclosed hereinabove.
  • FIG. 1 Cytotoxic activity of an anti-EpCAM ⁇ anti-CD3 antibody comprising three variable domains
  • the DNA encoding an anti-EpCAM ⁇ anti-CD3 bispecific antibody with a VL and VH in the anti-EpCAM portion of the molecule and only one antibody variable domain (VH) in the anti CD3 portion of the molecule are cloned in the multiple cloning site (MCS) of pET-20b(+) vector (Novagen).
  • MCS multiple cloning site
  • the expression of the bispecific antibody with a Histidine ( ⁇ 6) tag is induced with IPTG.
  • the choice of the vector facilitates the transport of the recombinant proteins into the periplasm.
  • Other cloning vectors such as pBAD-gIII (Invitrogen), pET-32 series (+) vector (Novagen) may also be used.
  • arabinose is used to induce recombinant gene expression instead of IPTG.
  • the DNA encoding the bispecific antibody is cloned in-frame with the sequence encoding the signal peptide (e.g., PeIB, OmpA) that mediates the transport of the recombinant protein into the periplasm.
  • the signal peptide e.g., PeIB, OmpA
  • the pET-20b (+) containing the DNA encoding the anti-EpCAM ⁇ anti-CD3 bispecific antibody described above is cloned and propagated in the bacterial host strain DH5.
  • the recombinant bispecific antibody is expressed using the BL21 (DE3) bacterial host strain (Novagen).
  • the Rosetta (DE3) bacterial host strain (Novagen) works when using a pET vector as described above.
  • the pBAD-gIII vector may be used with the TOP10 E. coli strain (Invitrogen).
  • a single colony of host cell transformed with the vector pET-20b(+) containing DNA encoding the anti-EpCAM ⁇ anti-CD3 bispecific antibody described above is selected and inoculated into 50 ml LB containing the essential antibiotics.
  • Cells are grown and harvested according to the supplier's instruction manual. The culture is incubated at 37° C. until an OD600 of 0.4 to 1.0 is reached (0.6 is an ideal value), followed by induction of expression by addition of appropriate amounts of IPTG. The incubation is continued for an additional 2–3 h.
  • Cultures as described are harvested by centrifugation.
  • the cell pellet is suspended in 30 ml of 30 mM Tris-HCl pH 8, 20% sucrose.
  • 60 ⁇ l of EDTA 0.5 M, pH 8 is added to a final concentration of 1 mM.
  • the cells are collected by centrifugation and the cell-pellet is subjected to shock by re-suspending the pellet thoroughly for 10 min in the cold with chilled MgSO 4 (5 mM, 30 ml) solution.
  • the shocked cells are subjected to centrifugation in order to separate the periplasmic (supernatant) and cellular (pellet) fractions.
  • the supernatant is then further analysed by SDS-PAGE and is also checked for activity.
  • Bispecific antibody produced as described above with a His tag is purified using a Ni—NTA spin column kit (Qiagen, catalog no. 31314) following the protocol provided in the Qiagen instruction manual.
  • Ni—NTA magnetic agarose beads Qiagen, catalog no. 36113 can also be used.
  • the polypeptide thus purified may be described as bispecific antibody with three antibody variable domains located on the same polypeptide chain.
  • the bispecific single chain antibody contains the following elements: anti-human EpCAM VL; 15 amino acid linker of sequence (Gly 4 Ser) 3 ; anti-human EpCAM VH; 5 amino acid spacer of sequence Gly 4 Ser; anti-human CD3 VH; His 6 .
  • the sequence is as set out in SEQ ID NO: 1.
  • the ability of the bispecific antibody with the sequence set out in SEQ ID NO: 1 to recruit the cytotoxic potential of human cytotoxic T cells to effect the killing of cells bearing the human EpCAM antigen was measured in a cytotoxicity assay as follows.
  • CHO cells from the American Type Cell Culture Collection (ATCC, USA) were transfected to express, human epithelial cell adhesion molecule (EpCAM) as the target antigen.
  • EpCAM epithelial cell adhesion molecule
  • Cells cultured from the resulting cell clone referred to as CHO-EpCAM cells, were subsequently used in the cytotoxicity experiments as the target cells.
  • the human cell line MC15 was used as a source of effector cells bearing the effector antigen CD3.
  • the cell clone was derived from the cell clone CB15, which is a CD4-positive human T cell clone kindly provided by Dr. Fickenscher at the University of Er Weg/Nürnberg, Germany. Cells were cultured as recommended by the respective suppliers.
  • target cells 1.5 ⁇ 10 7 target cells were washed twice with phosphate-buffered saline (PBS) and were labeled with PKH26 dye (Sigma-Aldrich Co.) according to the manufacturer's instructions. After staining, the cells were washed two times with 20 ml of PBS. Labeled CHO-EpCAM cells (target cells) and MC15 cells (effector cells) were mixed together in a ratio of 1:5, respectively. The resulting cell suspension contained 400,000 target and 2 ⁇ 10 6 effector cells per ml. BiTEs were diluted to different concentrations in alpha MEM/10% FCS-medium.
  • PBS phosphate-buffered saline
  • PKH26 dye Sigma-Aldrich Co.
  • each reaction (of volume 100 ⁇ l) contained a mixture of 20,000 target cells, 1 ⁇ 10 5 effector cells and a specific concentration of the bispecific antibody set out as in SEQ ID NO: 1. Measurements at each concentration of bispecific antibody were performed in triplicate. Reactions were incubated for about 20 h at 37° C./5% CO 2 .
  • Propidium iodide was added to a final concentration of 1 ⁇ g/ml. Propidium iodide stains dead cells.
  • the reaction samples were analyzed by flow cytometry (e.g., FACS-Calibur Becton Dickinson).
  • the population of PKH26-labeled target cells was gated in an FSC versus FL-2 plot and subsequent analysis of cells was carried out only with the cell population identified within this gate.
  • the percent of dead cells (propidium iodide stained) was determined in an FSC (forward scatter) versus FL-3 plot. Mean values were plotted against concentrations of bispecific antibody on a logarithmic scale, resulting in a typical dose response curve (see FIG. 1 ).
  • the EC 50 (the concentration of bispecific antibody required to elicit a half-maximal cytotoxic response) values were obtained after non-linear fitting of the data obtained with the GraphPad Prism software.
  • the bispecific antibody with the sequence as set out in SEQ ID NO: 1 showed activity as a recruiter of cytotoxic T cells. This follows from the fact that the target cells are efficiently killed (with an EC 50 value of about 12 ng/ml) in a manner depending on the concentration of bispecific antibody added to a respective reaction mixture in the presence of cytotoxic T cells.

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AU2004303510B2 (en) 2011-02-24
EP1697421A2 (de) 2006-09-06
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ATE479710T1 (de) 2010-09-15
CA2544562C (en) 2013-10-15
US20080305105A1 (en) 2008-12-11
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